looking over this list make me wonder how many of these Acronyms are really used by used by anyone. It looks like a lot of them are just made up as the writer went along. How about some "real" Acronyms, like:ANSI - American National Standards InstituteATF - Automatic transmission fluidBF3 - Break Fluid Dot 3BF4 - Break Fluid Dot 4OLMS - Oil life monitoring systemISO - International Organization of StandardizationPSF - Power steering fluidXOD - Extended oil drainSAE - Society of Automotive Engineering, andOD - Over due (Over Dose, sounds too much like we are into something that isn't car related.Cheers to all; have a great day!

Q: How Is a 0w30 oil with a ccs viscosity cP (D5293) @-35 degrees celcius with a rating of 3808 compare to one measured @ -20 with a ccs score of 5621?

"MotorOilEvaluator says:

The lower the temperature that an oil is tested at, the higher itís CCS viscosity number will be, and a 5 degree difference can actually have a pretty significant effect on that number.

Thus, IF the numbers you provided in your question above are correct and not typos, the first oil is CONSIDERABLY better than the second, at least in regards to cold weather cranking. This is because, if the first oil had been tested at -20 degrees vs -35 degrees, itís CCS value would actually be much lower than it already is at 3808.

Since the second oil is already considerably higher at 5621, the gap between the two would likely be even greater if both oils were tested at the same temperature.

That being said, be careful with this. It is not uncommon for spec sheets to have typos. A 0w30 oil MUST be tested at -35 degrees and achieve a CCS value of LESS than 6200 cP in order to be classified as a 0w oil. So, itís possible that your 0w30 oil which indicates it was tested at -20, may actually have been tested at the required -35, but the PDS was typed up incorrectly.

Either way, even if the second oil was tested at -35, if the 5621 cP number is correct, then, the first oil is still better in cold temps.

Of course, that doesnít say anything about itís performance in hot temps or other stressful conditions Ė just cold temps."